- from nepi.resources.ns3.ns3simulation import NS3Simulation
- for guid in self.connections:
- rm = self.ec.get_resource(guid)
- if isinstance(rm, NS3Simulation):
- return rm
-
- msg = "Node not connected to simulation"
- self.error(msg)
- raise RuntimeError, msg
-
+ if not self._simulation:
+ from nepi.resources.ns3.ns3simulation import NS3Simulation
+ for guid in self.connections:
+ rm = self.ec.get_resource(guid)
+ if isinstance(rm, NS3Simulation):
+ self._simulation = rm
+
+ if not self._simulation:
+ msg = "Node not connected to simulation"
+ self.error(msg)
+ raise RuntimeError(msg)
+
+ return self._simulation
+